function y = himmelbg(x)
% HIMMELBG function
% x0=1.5*ones(n,1)
n=length(x); y=0; 
m=n/2;
 for i=1:m
     y=y+(2*(x(2*i-1))^2+3*(x(2*i))^2)*exp(-x(2*i-1)-x(2*i));
 end


